Question # 1

The branch of science helps to understand chemcial product andprocess that reduce the use of hazadous substances.

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Green chemistry

Astrochemistry

Analytical chemistry

Physical Chemistry

How much heat absorbed when NH3decomposed into N2 and H2?

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90.4 kJ/mol

92.4 kJ/mol

94.2 kJ/mol

95.2 kJ/mol

How many elements are present in 1st period.

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1

2

8

18

Empirical formula of Benzene is.

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CH2O

CH

C2H

CH2

The mass of one molecule of water is.

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18 g

18 mg

18 kg

18 amu

All chemical reaction involves.

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Enzymes

Catalyst

Energy changes

All of these

Who use the word energy for the 1st time

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Rutherford

Bohr

Thomas Young

None of these

Bond formation energy of one O-H bond is............

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488 kJ/mol

484 kJ/mol

486 kJ/mol

489 kJ/mol

Which particle is present in differente number in the isotopes.

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Proton

Electron

Neutron

Both neutron and electron

Ionic compund are good conductors electricity in

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Solution

Molten state

Solid state

both a and b

Chlorine has two isotopes, both of which have

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Same mass Number

Same number of electrons

Same number of neurtons

Different number of protons

The horizontal lines present in the priodic table are called.

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Groups

Periods

Both a and b

None of these

What is the mass of AI in 204 g of aluminium oxide Al₂O₃

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26 g

54 g

108 g

27 g

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